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For the purpose of this demo we will be using the following SQL Server database table with the following records. Download the source code from here. To implement the preceding three functionalities please use the following procedure.
The first step is to create a new MVC 5 web application. Select Web from the installed template and choose the type of new project as ASP. Provide a meaningful name and click OK. Net MVC application will be created. So we have created the required MVC 5 application. The next step is to add a model that we will be working with. Adding a model is very simple. Choose EF Designer from the database as the model contents and click Next.
Click on the New Connection button. Specify the server name, select the authentication mode and select the database. Specify the connection string name and click Next. Select the table and click Finish. The next step is to add a Controller. Provide the controller a name. So, we have added our controller successfully. Now, if you look at the HomeController. So, in order to use the model class in our home controller, we need to import the model namespace as in the following: Before adding any of the functionality let's first check if we are able to retrieve the records from the database.
The next step is to add an Index view and adding a view is pretty straight forward. All we need to do is right-click on the Index action method and select add view.
Click Add and run the application. So, our application is working as expected. Now let's add searching, sorting and paging functionality one-by-one.
Search functionality Step 1. To implement this functionality, there are a few modifications that we need to make in our Index view. The preceding code should be placed just before the table. The rest the code in the Index view remains the same. Look at the URL.
It just states the local host port number. Now choose any of the options and specify the search keyword. Look at the URL: Choose another search option. Let's say we choose Gender this time and we want only the female student details. We got only the Female records. Choose the search option as the subject. So, we have successfully implemented search functionality. Now what will happen if we specify an invalid search term? The option is Gender but the search term is ff and there are no records in our table whose gender is ff.
So, we got a blank record. To get the preceding functionality we need to modify our Index view. Run the application and add some garbage. Paging functionality Step 1.
To implement Paging functionality the first thing we need to do is install PagedList. Mvc using the NuGet package manager. Mvc and click Install.
Add a "using" statement for the PagedList namespace into HomeController as in the following: Add a third parameter to the Index action method that will hold the page number and convert the returning view to a PagedList.
In the first parameter of the ToPagedList we specified the page number from where we want the paging to start and in the second parameter we specified the number of records we want to display. We need to modify the Index view.
As we know, this view is returning an IPagedList. But currently our view is returning an IEnumerable back. At the moment our Index view is returning only three records because, while passing the records to the view, we specified that only 3 records should be displayed in each page. Now we need to add page numbers so that we can view the rest of the records.
Now let's choose any of the search options and specify a valid search keyword. Here I choose the search option as Gender and the search term as Male. Now once I click on page 2 or 3 look what happens.
We are getting a Female record too. Look at the URL now as in the following: Click on Page 2. Page 3 The following is the entire Index. Now let's see how to implement sort functionality. Sorting functionality In our database table there are 9 records. But in an actual scenario there could be thousands of records and each record user name may start with any letter character and if there is a requirement to display all the records in an alphabetical order and that could be difficult.
To solve this problem we can use sorting. Let's say we want to sort the records by Name and we also want to sort the records by Gender too. When the page loads, we want to sort the records by Name in ascending order and once the Name column is clicked it should sort in descending order and so for the Gender column too. Click on the Name link. So now the records are sorted in descending order.
So, now we have the records for page 2 and this page too is sorted because we specified a sort parameter in PagedListPager html helper. Page 2 Specify the search option. And if we click the Name link then that will sort the records in descending order. The Name action link will still retain the search criteria because we have specified the option and search route values. Summary In this article we saw how easy it is to implement searching, sorting and paging functionality.
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Director of Institutional Effectiveness and Planning Ad Operates integrated library system ILS e. Handles payment of coffee, printing, and fines. Assists with printing and fax distribution. It isn't necessary to call the SaveChanges method after each group of entities, as is done here, but doing that helps you locate the source of a problem if an exception occurs while the code is writing to the database.
To tell Entity Framework to use your initializer class, add an element to the entityFramework element in the application Web. The context type specifies the fully qualified context class name and the assembly it's in, and the databaseinitializer type specifies the fully qualified name of the initializer class and the assembly it's in. When you don't want EF to use the initializer, you can set an attribute on the context element: As an alternative to setting the initializer in the Web.
The application is now set up so that when you access the database for the first time in a given run of the application, the Entity Framework compares the database to the model your SchoolContext and entity classes. If there's a difference, the application drops and re-creates the database. When you deploy an application to a production web server, you must remove or disable code that drops and re-creates the database.
You'll do that in a later tutorial in this series. It's easy to install and configure, starts on demand, and runs in user mode. LocalDB in particular is not recommended for production use with a web application because it is not designed to work with IIS. In this tutorial you'll work with LocalDB.
Open the application Web. Make sure you update the Web. There's also a Web. If you are using Visual Studio , replace "v The database doesn't exist yet; EF will create it. You don't actually have to have a connection string in the Web. If you don't supply a connection string, Entity Framework will use a default one based on your context class.
For more information, see Code First to a New Database. Now you'll create a web page to display data, and the process of requesting the data will automatically trigger the creation of the database. You'll begin by creating a new controller. But before you do that, build the project to make the model and context classes available to MVC controller scaffolding. In the Add Controller dialog box, make the following selections and then click Add:.
If you don't see this option in the drop-down list, build the project and try again. When you click Add , the scaffolder creates a StudentController.
In the future when you create projects that use Entity Framework you can also take advantage of some additional functionality of the scaffolder: The scaffolder will create your DbContext class and your connection string as well as the controller and views.
You see a class variable has been created that instantiates a database context object:. The Index action method gets a list of students from the Students entity set by reading the Students property of the database context instance:.
If you get a "Cannot create Shadow Copy" error, close the browser and try again. Click the Students tab to see the test data that the Seed method inserted. Depending on how narrow your browser window is, you'll see the Student tab link in the top address bar or you'll have to click the upper right corner to see the link.
When you ran the Students page and the application tried to access the database, EF saw that there was no database and so it created one, then it ran the seed method to populate the database with data.
For this tutorial you'll use Server Explorer. Right-click the Student table and click Show Table Data to see the columns that were created and the rows that were inserted into the table. Because you're using the DropCreateDatabaseIfModelChanges initializer, you could now make a change to the Student class, run the application again, and the database would automatically be re-created to match your change.
For example, if you add an EmailAddress property to the Student class, run the Students page again, and then look at the table again, you will see a new EmailAddress column.
The amount of code you had to write in order for the Entity Framework to be able to create a complete database for you is minimal because of the use of conventions , or assumptions that the Entity Framework makes. Some of them have already been noted or were used without your being aware of them:. You've seen that conventions can be overridden. For example, you specified that table names shouldn't be pluralized, and you'll see later how to explicitly mark a property as a foreign key property.
You'll learn more about conventions and how to override them in the Creating a More Complex Data Model tutorial later in this series. For more information about conventions, see Code First Conventions. In the following tutorial you'll learn how to perform basic CRUD create, read, update, delete operations.
The HttpGet Edit action method must perform two tasks, first it should fetch the student information from the underlaying data source, whose StudentId matches with the StudentId in the query string.
Second, it should render Edit view with the student information so that the user can update it. So, the Edit action method should have a StudentId parameter. MVC framework will automatically bind a query string to the parameters of an action method if the name is matches. Please make sure that parameter name matches with the query string. In a real life application, you can get the student from the database instead of sample collection. The above error occurred because we have not created an Edit view yet.
By default, MVC framework will look for Edit. To create Edit view, right click inside Edit action method and click on Add View.. It will open Add View dialogue.
Please notice that Edit.
Perform Sorting; Perform Searching; Perform Paging. Perform . Mvc. We add the links for paging in our Student\www.revelation-movie.com This NuGet. Become a student at MVC View the Registration Video on WebAdvisor; Search for classes on WebAdvisor, or you can download or search for classes on the. This article shows how to implement searching, paging, and sorting got a property Students which will give us all the student records back.